I can't say that I've done any extensive testing in the past on Apple Lossless format song files, but a quick test now indicates that they are simply AAC files without lossy compression. I had no problem reading and adding lyrics, artwork, etc. to these test files using MPFreaker.

Obviously these are large files, but if you could send a smallish one to support@lairware.com, I will look into what you're encountering.

From the fact that you don't have problem - the only difference in enviroment between you and me would be the language - I have set OSX language as English on the top at the preference, international, language. The tag data doesn't show up first, but when I select the songs and begin they appear again.